Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20d9258b9e3549a…

MALICIOUS

PDF

38.9 KB Created: 2020-06-01 01:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae9eabec457bed72a3813829ada5cb22 SHA-1: 79657216003da4926e13d42e2c07b3ab3b2f78bb SHA-256: b20d9258b9e3549a0a3474951705911209918aca3a09dfef161d75ef96c4a3ce
92 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains a significant number of external links, many pointing to WordPress hosted PDFs, which is indicative of a link farm or SEO spamming technique. One of the extracted URLs, http://webmail.harryvoltori.com/uploads/1/3/0/8/130874360/130874360.html#le+loup+qui+ne+voulait+pas+marcher, is flagged as suspicious. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://webmail.harryvoltori.com/uploads/1/3/0/8/130874360/130874360.html#le+loup+qui+ne+voulait+pas+marcher
    • https://kipevofi.files.wordpress.com/2020/05/tobafukonitefixasavope.pdf
    • https://pujobat.files.wordpress.com/2020/05/saxebefusogumusipos.pdf
    • https://vedusax.files.wordpress.com/2020/05/48354029690.pdf
    • https://fojubinoxob.files.wordpress.com/2020/05/61413004383.pdf
    • https://timowasufu57836677.files.wordpress.com/2020/05/91817877545.pdf
    • https://raxajigelo.files.wordpress.com/2020/05/54870589704.pdf
    • https://nevosoxe.files.wordpress.com/2020/05/40283996327.pdf
    • https://leforav.files.wordpress.com/2020/05/labojemaradoxugulumerilis.pdf
    • https://tinugezova.files.wordpress.com/2020/05/jomuz.pdf
    • https://xuromud.files.wordpress.com/2020/05/93395016441.pdf
    • https://kikibok.files.wordpress.com/2020/05/fizipuxudedikebewafa.pdf
    • https://tinugezova.files.wordpress.com/2020/05/23866536767.pdf
    • https://bazaroguj.files.wordpress.com/2020/05/61503771268.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000690a.bin
dc46e47eaf00ce1f05f9f0aeaf4e07132b8a5a35abb8449065ef5ab8644d9cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690A 12356 bytes

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